I think I don't like the limited randomness. You have a die result of -5 to 5, which I guess is a space of 11. I'd kinda like to try it with a d10 instead of a d6, giving you a range from -9 to 9. Although critical fails or successes would be more rare. You can compensate for that (if you feel you need to) by making any match a crit. OR, you could make the 0 on the d10 be an actual zero, which gives you from -8 to 8, and then anything combined with a 0 is a crit. If you want to complicate things, you could make the negative die coming up as a "0" result in a bad side effect, even if you succeed, and the positive die result of "0" minimizing bad effects fo failures and enhancing successes. Hrm... I'm thinking of trying that.
And yeah, it's weird that it's a big book designed for what are essentially going to be treated as quick and dirty movie recreations, but I think you could do a whole campaign with a good gm.
And one more thing about FS, I no longer feel any attachment to d20 Modern. I've always thought that it was really only going to be a good system for doing a "jackie chan" or "Arnold" movie type story, but that it did a pretty decent job at that. However, Feng Shui is winning me over with the single exception of the dice, Weird. Maybe I'll get used to it. I believe it works much better for the action movie recreation (which it is supposed to be). So, I guess the only reason I would play d20 Modern now is if I was interested in being able to convert over to D&D or d20 Traveller (which I hate, so I find it unlikely). It also means I'll have difficulty NOT panning the "Urban Arcana" book WotC just sent. Maybe I'll trade that in along with the "Unknown East" or whatever it is that Wizards also sent me. Fell, you got that already and have someone excited to review them?
I guess with all I've written I should do a review. That and one of Unknown Armies (also by Atlas) should be coming soon.
